Adding a S-meter to TenTec 1254 Shortwave Receiver

[sb303ssb]

Great video. Where did you get the meter?

Thanks, K4DAA

[w2aew]

@sb303ssb It was in a box of parts/junk that a friend gave me a few years ago. So, I'm sorry I can can't provide you a source.

[spectralcodec]

Great video, thanks!

[RadioHamGuy]

Good information and video, thanks..

[orbiter8]

Great project. Thanks for the full explanation on how you got it working.

[MEverett98]

Thanks for the great video. It was interesting how you determined how to dc bias using a graph with your measurments. I like how simple your circuit is using a dual op amp. Very handy for builders of homebrew rigs. If you where to use a S meter, would you need to have a log amp for the 6db change per S-unit?

[w2aew]

@MEverett98 Either a log amp, or an AGC circuit that responds to the log of the input power. In the case of this receiver, the AGC function is done with gain controlled amplifiers in the 2nd IF, and supplemented with PIN diode attenuation at the RF front end. The result is that the AGC vs. Power is non-linear w.r.t voltage, power or dB - so I didn't really make any attempt in this case to have any kind of calibrated response.

[347DIESELMOBILE]

impressive work thanks for sharing...

[royeh]

Very nice. TNX for showing this.